>> we did hear romney did a full debate dress rehearsal yesterday. and we're also told he's been practicing some zingers. and as you heard president obama saying don't necessarily expect any zingers. we learn he's working on keeping answers brief. but how important is it to have that moment, that line that gets replaying over and over the next day. >> i think it's more important to sort of attack with a knife on the economy and on foreign policy of what's happened the last three weeks which haven't been a good three weeks for the president. i think romney will try to unnerve the president by challenging him directly on this. saying you failed to lead these last three weeks and your vision for the economy is just wrong and try to get under his skin that way. i don't think obama is very flappable. but in terms of these are your policies, they don't work. we tried likable. now we need competent, he's probably going to try to do that. >> we all remember the zingers. i knew jack kennedy. we remember those things. but ultimately voters do they take away a